Google banned dozens of applications from its Google Play Store in which it identified hidden data-harvesting software, The Wall Street Journal reports. Measurement Systems, which wrote the code that ran on millions of Android devices, is tied to U.S. national security contractors, according to documents. The code was found within Muslim prayer apps, a highway speed-trap detection app, a QR-code reading app and others. Researchers said the software enabled the company to collect user data, including precise location and personal identifiers.